Police believe the two were acquainted, and that the shooting occurred after the two got into an argument at the victim's front doorstep, he said.

"I have no idea what precipitated this," Mitchell said.

The identity of the woman and other details have not yet been released.

Witnesses gave police a description of the alleged shooter's car, allowing them to arrest her a short time later at a home on the 4100 block of Vista, about three and a half miles away.

Mitchell said that while police were heading to the home of the alleged shooter, they received a call from a person telling them they'd found a handgun tossed out of a car on Cherry Brook Lane.

"We think that's probably the murder weapon," he said, but added it still needed be examined by the department's forensic analysts.

Details about the woman and what the motivation for the shooting are unclear at this time.

The women were in their mid-50s, Mitchell said.

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